7TV emotes for OBS Studio's Chat

Basically adds this javascript code (7TV FFZ Addon) to the auth-twitch.cpp file

    static const char *stv_script = "\
    var stv = document.createElement('script');\
    stv.setAttribute('src','https://cdn.jsdelivr.net/gh/elmarceloc/seventv-build/content.js');\
    document.head.appendChild(stv);";